Abstract
Trifolium tumens Stev. ex M. B is a perennial legume with long‐lived and deep rooting from the Vesicaria section in Trifolium genus. It is distributed in Iran. The base chromosome number (x = 8) in the population, confirmed the views of the previous researchers. In this study, the number of chromosomes in the mitotic metaphase stage in the meristematic cells of the root ends were counted in six populations of Trifolium tumens. Also, chloroplast count of stomata guard cells, morphological studies, pollen grain size and flowcytometry were studied in six accessions. Our results showed that this species has ploidy level (2n=16, 2n=32). and the tetraploid state in the species T. tumens is reported. Through flowcytometry, chloroplast count of stomata guard cells and compare the pollen grain, different characters were showed between diploid and tetraploid populations, too. Based on the results, this new cytotype is reported from Iran.
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